Three new species of freshwater crabs from northern Laos, with a note on Potamiscus (Ranguna) pealianoides

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1 Three new species of freshwater crabs from northern Laos, with a note on Potamiscus (Ranguna) pealianoides Bott, 1966 (Crustacea, Decapoda, Brachyura, Potamidae) Darren C. J. YEO Department of Biological Sciences, Faculty of Science, the National University of Singapore, 10 Kent Ridge Crescent, Singapore (Singapore) scip6086@leonis.nus.edu.sg Phaibul NAIYANETR Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok (Thailand) Yeo D. C. J. & Naiyanetr P Three new species of freshwater crabs from northern Laos, with a note on Potamiscus (Ranguna) pealianoides Bott, 1966 (Crustacea, Decapoda, Brachyura, Potamidae). Zoosystema 21 (3) : KEYWORDS Crustacea, Brachyura, Potamidae, systematics, new species, Laos. ABSTRACT Three new species of potamid crabs are described from northern Laos, viz., Potamon lao n. sp., Dromothelphusaprabang n. sp. and Thaipotamon kittikooni n. sp. Potamon lao n. sp. is characterized by its squarish carapace, third maxilliped with an elongate rectangular ischium and a short but distinct flagellum on the exopod, and its stout male first pleopod (G1) with a weak dorsal flap on the terminal segment. The key distinguishing features of Dromothelphusa prabang n. sp. are its low epibranchial tooth, broadly triangular external orbital angle and stout Gl terminal segment. Thaipotamon kittikooni n. sp. is readily distinguished from its congeners by its sharp, distinctly cristate anterolateral carapace margins and by the densely setose outer margin of the third maxilliped exopod. Potamon lao n. sp. and Dromothelphusa prabang n. sp. are close to Potamiscus (Ranguna) pealianoides Bott, 1966, which is here transferred to the genus Dromothelphusa Naiyanetr, (3) 483

2 Yeo D. C. J. & Naiyanetr P. MOTS CLES Crustacea, Brachyura, Potamidae, systématique, nouvelles espèces, Laos. RESUME Trois nouvelles espèces de crabes d'eau douce du nord Laos, avec une annotation sur Potamiscus (Ranguna) pealianoides Bott, 1966 (Crustacea, Decapoda, Brachyura, Potamidae). Trois espèces nouvelles de crabes Potamidae sont décrites du nord Laos, Potamon lao n. sp., Dromothelphusa prabang n. sp. et Thaipotamon kittikooni n. sp. Potamon lao n. sp. est caractérisée par sa carapace presque carrée, son troisième maxillipède avec un ischion allongé et rectangulaire et un flagelle court mais distinct sur l'exopodite et son premier pléopode mâle trapu (Gl) avec un lobe dorsal peu marqué sur le segment terminal. Les caractères distinctifs de Dromothelphusa prabang n. sp. sont la dent épibranchiale basse, l'angle orbito-externe largement triangulaire et le segment terminal de Gl, fort. Thaipotamon kittikooni n. sp. se distingue facilement de ses congénères par les bords antéro-latéraux aigus et distinctement cristiformes de la carapace et par le bord externe de l'exopodite du troisième maxillipède densément sétifère. Potamon lao n. sp. et Dromothelphusa prabang n. sp. sont proches de Potamiscus (Ranguna) pealianoides Bott, 1966, qui est ici transféré dans le genre Dromothelphusa Naiyanetr, INTRODUCTION Specimens of potamid crabs in the second author's collection from the northern Laotian provinces of Xieng Khuang and Luang Prabang, were recently examined as part of an ongoing revision of the Indochinese freshwater crabs. They consist of three undescribed species from three genera, viz., Potamon, Dromothelphusa and Thaipotamon. None of these are conspecific with the 11 species of potamid crabs in four genera which have so far been reported from modern Laos and eastern Thailand (previously Laos, Siam) (Rathbun 1904; Bott 1970; Ng & Naiyanetr 1995; Ng 1996), and can be separated from them by differences in carapaces, male abdomens and gonopods. Potamon lao n. sp. and Dromothelphusa prabang n. sp. closely resemble Potamiscus (Ranguna) pealianoides Bott, 1966, a species whose generic placement is unclear. The present paper serves to clarify the generic placement of P. (R.) pealianoides as well as to describe the three new species. The following abbreviations are used: Gl for male first pleopod, G2 for male second pleopod. Measurements are of carapace width and length respectively. Terminology used essentially follows Ng (1988). All measurements are in millimetres. Specimens are deposited in the Zoological Reference Collection (ZRC) of the Raffles Museum, National University of Singapore; the Chulalongkorn University Natural History Museum (CUMZ), Bangkok, Thailand; Nationaal Natuurhistorische Museum [formerly Rijksmuseum van Natuurlijke Histoire (RMNH)], Leiden, The Netherlands; Museum national d'histoire naturelle (MNHN), Paris, France; Senckenbergischen Naturforschenden Gesellschaft (SMF), Frankfurt, Germany; and Zoologisk Museum (ZMUC), Copenhagen, Denmark. SYSTEMATICS Family POTAMIDAE Ortmann, 1896 Potamon lao n. sp. (Figs 1;2) MATERIAL EXAMINED. Northern Laos. Ban Xieng Dad, Muang Phu Kut (Muang Sui), Xieng Khuang Province, V. 1995, coll. Viroj Kittikoon, holotype, o 46.4 by 38.3 mm (ZRC ). Same data as holotype, by 36.4 mm (paratype ZRC ). 484

3 New species of freshwater crabs from Laos FIG. 1. Potamon lao n. sp. Holotype, d 46.4 by 38.3 mm (ZRC ), Ban Xieng Dad, Muang Phu Kut (Muang Sui), Xieng Khuang Province, northern Laos; A, dorsal view; B, frontal view. Scale bars: A, 15.0 mm; B, 7.0 mm. ETYMOLOGY. The species is named after the people of Laos, known as "Lao". Used as a noun in apposition. DIAGNOSIS Carapace broader than long, high, dorsal surface relatively flat, glabrous. Epigastric cristae distinct, not sharp, rugose; postorbital cristae not sharp, weakly rugose, breaking up into strong granules just before epibranchial tooth; regions behind epigasttic and postorbital cristae faintly rugose. External orbital angle acutely triangular, outet margin slightly convex; epibranchial tooth trian- ZOOSYStEMA (3)

4 Yeo D. C. J. & Naiyanetr P. gular, low; anterolateral margin convex, distinctly serrated, strongly cristate; posterolateral margins not strongly convergent posteriorly; branchial region distinctly rugose. Ischium of third maxilliped elongate rectangular; exopod extending beyond distal margin of ischium and with very short but distinct flagellum, less than half merus width. Ambulatory legs long, with long, very slender dactyli. Suture between thoracic sternites three and four not visible. Male abdomen narrowly triangular; telson triangular, with slightly concave lateral margins. Gl terminal segment obliquely bent about 45 degrees, about 0.3 time length of subterminal segment, broad, about 3.1 times longer than broad, with low, weak but distinct dorsal flap, slightly curved at tip, with ventral distal opening; subterminal segment gently sinuous, without neck-like distal part, inner margin gently concave, outer margin without sub-distal cleft. G2 with distal segment greater than half length of basal segment. REMARKS Potamon lao n. sp. fits into Alcock's (1910) definition of the genus Potamon by virtue of its very short but distinct flagellum on the third maxilliped exopod. The emphasis of a single character in this case to assign a species to a genus is purely a stop-gap measure as the genus Potamon is known to be heterogeneous but has yet to be revised (see Naiyanetr & Ng 1990; Ng & Naiyanetr 1993). Potamon lao might be confused with Dromothelphusa species [Thailand, Vietnam] or crabs of the genus Terrapotamon Ng, 1986 [Thailand], due to their similar carapace physiognomy and long, slender dactyli of the walking (ambulatory) legs. However, P. lao is excluded from both genera because its third maxilliped ischium is elongate rectangular in shape (versus ischium broadly rectangular to squarish) (Fig. 2A; cf. Ng 1988: fig. 37C; Ng & Naiyanetr 1993: fig. 49A, 1998: fig. 1C; Naiyanetr 1997: fig. ID). In addition, P. lao does not have the diagnostic characters of the genus Dromothelphusa in that its Gl has a stout terminal segment that is straight for most of its length but very gently curved outwards distally (versus slender terminal segment that is distinctly curved outwards); the dorsal flap on the terminal segment is very low and hardly visible (versus dorsal flap on terminal segment distinct); and the subterminal segment is not distinctly narrowed distally (versus subterminal segment distinctly narrowed distally) (Fig. 2B-C, E-F; cf. Bott & Tiirkay 1977: fig. 1; Ng & Naiyanetr 1993: fig. 49; Naiyanetr 1994: figs 1D-E, 2D-E, 1997: fig. IE). Potamon lao also differs further from Terrapotamon species in its third maxilliped exopod possessing a short but distinct flagellum (versus third maxilliped exopod lacking a flagellum); its Gl lacking any swelling on the outer margin at the terminal-subterminal segment junction; and the Gl terminal segment possessing a very low dorsal fold (versus Gl terminal segment completely lacking a dorsal fold) (Fig. 2A; cf. Ng 1986: fig. 2A-C, 1988: fig. 37C- F; Ng & Naiyanetr 1998: fig. 1C, F-I). Potamon lao most closely resembles Dromothelphusa pealianoides (Bott, 1966). In addition to having similar carapace physiognomy, rugosity, forms of the external orbital angle, epibranchial tooth, anterolateral margin, and also walking legs long with very slender dactyli, the form of the terminal segment of the Gl is similar in both species (Fig. 2C-D; cf. Bott 1966: fig. 16, pi. 17 fig. 3). Despite these similarities, P. lao can be differentiated from D. pealianoides by the following features: 1) carapace relatively more squarish, about 1.2 time broader than long (versus distinctly more transverse, about 1.4 times broader than long); 2) third maxilliped ischium elongate rectangular in shape (versus broadly rectangular); 3) Gl terminal segment relatively more stout (versus distinctly more slender); and 4) Gl terminal segment with low, very weak dorsal flap (versus distinct, well-developed dorsal flap). Dromothelphusa pealianoides (Bott, 1966) Potamiscus (Ranguna) pealianoides Bott, 1966: 482, fig. 16, pi. 17 fig. 3. Ranguna (Ranguna) pealianoides. - Bott 1970: 165, fig. 5, pi. 47 fig. 32. MATERIAL EXAMINED. Laos. coll. Neis, no date, holotype, cj c. 49 by 36 mm (MNHN-B 5268). REMARKS There is no need for a redescription of this spe-

5 New species of freshwater crabs from Laos FIG. 2. Potamon lao n. sp. Holotype, d 46.4 by 38.3 mm (ZRC ), Ban Xieng Dad, Muang Phu Kut (Muang Sui), Xieng Khuang Province, northern Laos; A, left third maxilliped; B, dorsal view of terminal segment of right G1; C, ventral view of terminal segment of right G1; D, right G2; E, dorsal view of right G1; F, ventral view of right G1; G, telson and sixth segment of male abdomen. Scale bars: A, D-G, 2.0 mm; B, C, 1.0 mm. 487

6 Yeo D. C. J. & Naiyanetr P. cies as which was described relatively recently by Bott (1966). Bott (1966) had described Potamiscus (Ranguna) pealianoides from a male specimen collected by Neis from Laos and identified as "Potamon pealianum" [not Wood-Mason, 1871] by Rathbun (1904). This specimen is quoted by Bott (1966) in his publication as MPa which corresponds to the date of the entry (1895) in the Reference Collection of the Museum. It is now catalogued as MNHN-B 5268 (Daniele Guinot, in lift.) and represents the holotype of Potamiscus (Ranguna) pealianoides. We have examined this holotype (c. 49 by 36 mm) and determined that the species must now be transferred to the genus Dromothelphusa Naiyanetr, Dromothelphusa is a newer name for part of the species formerly placed under Ranguna and was redefined by Ng & Naiyanetr (1993). One point bears mention. Although Ng & Naiyanetr (1993: 21) wrote that members of the genus had "...relatively short ambulatory dactyli", this is a typographical error and it should have tead "relatively long ambulatory dactyli" instead (P. Ng, pers. comm.). We have examined specimens of the known Dromothelphusa species and can confirm that relatively long dactyli of the walking legs are present in all of them. Potamiscus (Ranguna) pealianoides possesses the typical diagnostic characters of Dromothelphusa mentioned by Ng & Naiyanetr (1993), including a high, relatively domed carapace, almost confluent epigastric and postorbital cristae, a triangular external orbital angle, walking legs with relatively long dactyli, a telson with slightly concave latetal margins and a dorsal fold on the Gl. The species also has other featutes characteristic of most or all Dromothelphusa members, such as the third maxilliped having a broadly rectangular ischium, an exopod with a very short, almost vestigial flagellum, and a Gl with distally slender subterminal segment and slender, tapering terminal segment, curving outwards. Dromothelphusa prabang n. sp. (Figs 3; 4) MATERIAL EXAMINED. Northern Laos. Local market, Luang Prabang Province, coll. P. Naiyanetr, XII.1995, holotype, S AIA by 32.9 mm (ZRC ). Same data as holotype, 2 S ó* latger 50.3 by 38.2 mm (paratypes ZRC ). Same data as holotype, 17 cî c?, largest 48.3 by 37.3 mm (paratypes CUMZ). Same data as holotype, 1 o* 42. i by 32.7 mm, 1 2 (paratypes RMNH). Same data as holotype, 1 S 44.2 by 34.0 mm, 1 2 (paratypes MNHN). Same data as holotype, 1 o*, by 32.6 mm (paratypes SMF). Same data as holotype, 1 S 36.2 by 28.0 mm, 1 2 (paratypes ZMUC). ETYMOLOGY. The species is named after the city and province of Luang Prabang, "Prabang" being the actual name of the city, while "Luang" alludes to capital. Used as noun in apposition. DIAGNOSIS Catapace broader than long, high, dorsal surface distinctly convex longitudinally, gently convex laterally, glabrous. Epigastric cristae distinct, not sharp, rugose, slightly anterior to postorbital cristae, separated from postorbital ctistae by short, weak groove; postorbital cristae not sharp, weakly rugose, breaking up into granules just before epibranchial tooth; regions behind epigastric and postorbital cristae very faintly rugose. External orbital angle triangular, outer margin straight to gently convex; epibranchial tooth acute, low; anterolateral margin convex, serrated, distinctly cristate; posterolateral margins convergent posteriorly; branchial region distinctly granulose. Ischium of third maxilliped broadly rectangular; exopod extending beyond distal margin of ischium, with very short but well-developed flagellum, less than half merus width. Ambulatory legs long, with long, very slender dactyli. Suture between thoracic sternites 3 and 4 barely discernible. Male abdomen triangular; telson triangular, with distinctly concave lateral margins, tip rounded. Gl terminal segment about 0.4 time length of subterminal segment, about 3.3 times longer than broad, bent slightly outwards, curved medially with distal part almost perpendicular to longitudinal axis, with vety low, broad dorsal fold in proximal half, tip sttaight, with ventral distal opening; subterminal segment broad, narrowing distally into neck-like portion, outer margin with shallow, broad subdistal cleft. G2 with distal segment greater than half length of basal segment.

7 New species of freshwater crabs from Laos FIG. 3. Dromothelphusa prabang n. sp. Holotype, S 41.4 by 32.9 mm (ZRC ), local market, Luang Prabang Province, northern Laos; A, dorsal view; B, frontal view. Scale bars: A, 20.0 mm; B, 7.0 mm. REMARKS In the majority of the specimens of Dromothelphusa prabang, the third maxilliped exopod has a very short but distinct flagellum (Fig. 4B, C, E). However, in the holotype (ZRC ), as well as in a few other specimens, the third maxilliped flagellum appears to be even shorter to almost vestigial, due to breakage (Fig. 4A, D). Dromothelphusa prabang n. sp. appears morphologically closest to D. pealianoides (Bott, 1966) [Laos]. Dromothelphusa prabang, however, can be differentiated from D. pealianoides by the following characters: 1) low, small epibranchial tooth 489

8 Yco D. C. J. & Naiyanetr P. FIG. 4. Dromothelphusa prabang n. sp; A, F-J, holotype, <J 41.4 by 32.9 mm (ZRC ); B, paratype, S 42.1 by 32.7 mm (RMNH); C, paratype, by 32.6 mm (SMF); D, paratype, by 29.3 mm (RMNH); E, paratype, o* 50.3 by 38.2 mm (ZRC ); all from local market, Luang Prabang Province, northern Laos; A, left third maxilllped; B-E, exopod flagellum of left third maxilliped; F, right G2; G, dorsal view of terminal segment of right G1; H, ventral view of terminal segment of right G1; I, dorsal view of right G1; J, ventral view of right G1; bf, broken flagellum. Scale bars: A-F, I, J 2.0 mm; G, H, 1.0 mm.

9 New species of freshwater crabs from Laos separated from external orbital angle by weak cleft (versus well-developed epibranchial tooth separated from external orbital angle by strong cleft); 2) anterolateral margins very weakly serrated (vetsus distinctly serrated); 3) external orbital angle comparatively more broadly triangular (versus acutely triangular); 4) Gl subtetminal segment broad (versus relatively slender); and 5) Gl terminal segment relatively stout, with very low, weak, barely visible dorsal fold (versus relatively more slendet, with high, well-developed, distinct dorsal fold) (Figs 3; 4; cf. Bott 1966: fig. 16, pi. 17; fig. 3). Dromothelphusa prabang might also be confused with the Dromothelphusa species from Thailand, viz., D. phrae (Naiyanetr, 1984), D. namuan Naiyanett, 1994, D. nayung Naiyanett, 1994, and D. sangwan Naiyanetr, Externally, however, the low epibranchial tooth of D. prabang immediately distinguishes it from the Thai species which have relatively higher, better developed epibranchial teeth that, like in D. pealianoides, are also separated from the external orbital angles by strong clefts. In the G1, the low, barely visible dorsal flap of the terminal segment of D. prabang separates it from D. phrae, D. namuan and D. nayung, all of which have relatively higher, more distinct dotsal flaps. Dromothelphusa sangwan is the only other member of the genus which has a relatively low dorsal flap of the Gl terminal segment. However, the dorsal flap of D. sangwan is still distinctly higher than that of D. prabang. In addition, the terminal segment of D. sangwan is also less strongly bent than that of D. prabang. Thaipotamon kittikooni n. sp. (Figs 5; 6) MATERIAL EXAMINED. Northern Laos. Ban Xieng Dad, Muang Phu Kut (Muang Sui), Xieng Khuang Province, coll. Viroj Kirrikoon, V. 1995, holorype,? 25.9 by 20.8 mm (ZRC ). ETYMOLOGY. This species is named after its collector, Associate Professor Dr Viroj Kittikoon. DIAGNOSIS Carapace slightly broader than long, very high, dorsal surface strongly convex longitudinally, gently convex laterally, glabrous. Epigastric and postorbital cristae weak but distinct, not sharp, rounded, former very weakly rugose; regions behind epigastric and postorbital cristae smooth. External orbital angle acutely triangular, outet margin straight; epibranchial tooth rounded, low; anterolateral matgin gently convex, sharp, distinctly cristate; posterolateral margins gently converging posteriorly; branchial region with few very faint rugae. Ischium of third maxilliped broadly rectangular; exopod extending to about one third of merus length, densely setose on outer margin, with short but well-developed flagellum, subequal to or less than half merus width. Ambulatory legs slender; meri slender, with latetal matgins straight, almost parallel; dactyli long, very slender. REMARKS Thaipotamon kittikooni n. sp. differs from all other members of the genus Thaipotamon Ng & Naiyanetr, 1993, in the following external asexual characters: 1) carapace slightly swollen laterally (versus strongly swollen laterally); 2) subbranchial regions of carapace almost sttaight (versus convex); 3) anterolateral margins gently convex, sharp, distinctly cristate (versus convex to strongly convex, rounded, neither sharp nor cristate); 4) posterolateral margins gently converging posteriorly (versus strongly converging); 5) third maxilliped exopod densely setose on outer margin (versus glabrous); and 6) walking legs with meri very slender, with straight, almost parallel lateral margins (versus relatively broader, with gently convex lateral margins). These differences clearly distinguish T. kittikooni as a distinct species and, in fact, may warrant the establishment of a separate genus fot it, especially in the cristate anterolateral margin and densely setose third maxilliped exopod. However, no male specimens are available and we have, therefore, been unable to characterize the taxonomically important Gls, which is likely to be significantly different from the Thaipotamon G1. As such, until a male specimen is obtained and the Gl examined, we prefer to tentatively refer this species to Thaipotamon since it does closely resemble the other Thaipotamon species in its distinctly curved third maxilliped exopod bearing 491 I

10 Yeo D. C. J. & Naiyanetr P. FIG. 5. Thaipotamon kittikooni n. sp. Holotype, by 20.8 mm (ZRC ), Ban Xieng Dad, Muang Phu Kut (Muang Sui), Xieng Khuang Province, northern Laos; A, dorsal view; B, frontal view. Scale bars; A, 7.0 mm; B, 4.0 mm. a short but distinct flagellum, about subequal to with crabs from the terrestrial genus, Pudaengon half the width of the merus; high, swollen, gene- Ng & Naiyanetr, 1995 (type species Pudaengon rally smooth carapace; and walking legs with mukdahan Ng & Naiyanetr, 1995). Thaipotamon long dactyli (see Ng & Naiyanetr 1993). kittikooni, however, can be distinguished from Thaipotamon kittikooni may also be confused members of the latter by more prominent antero-

11 New species of freshwater crabs from Laos B FIG. 6. Thaipotamon kittikooni n. sp. Holotype, by 20.8 mm (ZRC ), Ban Xieng Dad, Muang Phu Kut (Muang Sui), Xieng Khuang Province, northern Laos; A, right third maxilliped; B, anterolateral margin of carapace. Scale bars: A, 2.0 mm; B, 5.0 mm. lateral margin cristae (versus minute cristae); strongly curved and proportionately longer third maxilliped exopod, extending to about one third the length of the merus (versus gently curved and proportionately shorter, subequal to or slightly exceeding distal margin of ischium); presence of a flagellum on the third maxilliped exopod (versus flagellum absent); and the posterolateral margins gently converging posteriorly (versus distinctly converging posteriorly). Acknowledgments We are grateful to Associate Professor Dr Viroj Kittikoon (Mahidol University, Thailand) for collecting some of the specimens; Prof. Daniele Guinot (MNHN) for the loan of the holotype of Potamiscus pealianoides and for her help in verifying its data; Mrs C. M. Yang (ZRC) for access to material under her care; and Mr H. K. Yip for developing the prints. This study is partially supported by research grant RP to Dr Peter Ng from the National University of Singapore. REFERENCES Alcock A Bracbyura I. Pasc. II: The Indian Freshwater Crabs - Potamonidae. Catalogue of the Indian Decapod Crustacea in the collection of the Indian Museum. Indian Museum, Calcutta, 135 p. Botr R Potamiden aus Asien {Potamon Savigny und Potamiscus Alcock) (Crustacea, Decapoda). Senckenbergiana biologica 47: Bott R Die Süsswasserkrabben von Europa, Asien, Australien und ihre Stammesgeschichte. Eine Revision der Potamoidea und Parathelphusoidea (Crustacea, Decapoda). Abhandlungen Senckenbergischen Naturforschenden Gesellschaft 526, 338 p. Bott R. & Türkay M Nachtrag zur Revision der Süsswasserkrabben von Europa, Asien und Australien. Die verwandtschaftlichen Beziehungen von Ranguna longipes (A. Milne- Edwards 1869) (Crustacea: Decapoda: Potamidae). Senckenbergiana biologica 58 (1/2): Naiyanetr P Ranguna phrae, a new species of land crab of Thailand. Seminar on Wildlife of Thailand, Faculty of Forestry, Kasesart University, Bangkok 5: 231. Naiyanetr P Two new species of terrestrial crabs of the genus Potamon Savigny, 1816 from 493

12 Yeo D. C. J. & Naiyanetr P. Thailand (Decapoda: Potamidae): 44, in International Senckenberg Symposium. Abstract volume, Frankfurt am Main, Germany, October 18-22, Naiyanetr P Demanietta sirikit n. sp., a new freshwater crab from Thailand (Decapoda, Brachyura, Potamidae). Crustaceana 62: Naiyanetr P On two species of terrestrial crabs of the genus Dromothelphusa Naiyanetr, 1992 (Crustacea: Decapoda: Brachyura: Potamidae) from Thailand. Raffles Bulletin of Zoology 42: Naiyanetr P Dromothelphusa sangwan n. sp., a new freshwater crab from Thailand (Decapoda, Brachyura, Potamidae). Crustaceana 70: Naiyanetr P. & Ng P. K. L Two new species of Potamon Savigny, 1816 s. 1. from Chiangmai Province, north-western Thailand, with a note on Potamon (Potamon) cochinchinense De Man, 1898 (Crustacea, Decapoda, Brachyura, Potamidae). Spixiana 13: Ng P. K. L Terrapotamon gen. nov., a new genus of freshwater crabs from Malaysia and Thailand, with description of a new species, Terrapotamon aipoae gen., new species (Crustacea: Decapoda: Brachyura: Potamidae). Journal of Natural History 20: Ng P. K. L The Freshwater Crabs of Peninsular Malaysia and Singapore. Department of Zoology, National University of Singapore, Shinglee Press, Singapore, 156 p. Ng P. K. L Establishment of two new genera for Potamon lacunifer Rathbun, 1904, and Potamon laosensis Rathbun, 1904 (Decapoda, Brachyura, Potamidae) from Laos. Crustaceana 69: Ng P. K. L. & Naiyanetr P New and recently described freshwater crabs (Crustacea: Decapoda: Brachyura: Potamidae, Gecarcinucidae and Parathelphusidae) from Thailand. Zoologische Verhandelingen 284: Ng P. K. L. & Naiyanetr P Pudaengon, a new genus of terrestrial crabs (Crustacea: Decapoda: Brachyura: Potamidae) from Thailand and Laos, with descriptions of seven new species. Raffles Bulletin of Zoology 43: Ng P. K. L. & Naiyanetr P Terrapotamon palian sp. nov., a second member of the terrestrial crab genus Terrapotamon (Decapoda, Brachyura, Potamidae) from southern Thailand. Crustaceana 71 (5): Ortmann A Das System der Decapoden- Krebse. Zoologische Jahrbücher 9: Rathbun M. J Les crabes d'eau douce. Nouvelles Archives du Muséum d'histoire naturelle (4) 6: Wood-Mason J Contribution to Indian carcinology. Journal of the Asiatic Society of Bengal 40 (2): Submitted on 23 August 1998; accepted on 23 November

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